Patents Assigned to Franz Rittmeyer AG
  • Quartz resonating force and pressure transducer
    Patent number: 4644804
    Abstract: A thin, piezoelectric membrane provided on both surfaces with electrodes, which may be disc-shaped or ring-shaped, is made to oscillate in the piezoelectric manner and the membrane is arranged to have some exterior force or pressure applied thereto, whereby changes in the frequency of oscillation are in response to the size of the force exerted on the membrane.
    Type: Grant
    Filed: July 17, 1984
    Date of Patent: February 24, 1987
    Assignee: Franz Rittmeyer AG
    Inventors: A. Jurgen Ramm, Jerome Formaz